Make a full site backup before updating theme.
To update your theme to new version just add new and replace changed files.
Don't forget to clear Magento Cache after uploading new files.
Added - Magento 1.9.0.1 support
Fixed - Magento 1.8 compatibility problems
app/design/frontend/default/simplegreat/layout/checkout.xml
Remove file - app/design/frontend/default/simplegreat/template/checkout/onepage.phtml
Remove file - app/design/frontend/default/simplegreat/template/review/form.phtml
Fixed - Bundle product price live update calculations
app\design\frontend\default\simplegreat\template\bundle\catalog\product\view\type\bundle.php
Fixed - Categories Toolbar overflow if you have a lot of product pages
Fixed - Pages navigation for categories in responsive view
skin/frontend/default/simplegreat/css/styles.css
skin/frontend/default/simplegreat/css/responsive.css
Added - New ready to set predefined color skins - Green, Lightblue, Orange, Red, Cyan, Pastel
Added -
Revolution slider updated to latest version
Fixed - Category menu for 3 level and deeper will show disclosure indicator now (unlimited sub-categories level support)
Fixed - Search field overflow cart dropdown
Fixed - Twitter username field is empty in admin panel by default now
Fixed - Floating blocks will be hided on tablets
Fixed - Product Code on product page now display SKU
skin/frontend/default/simplegreat/css/styles.css
skin/frontend/default/simplegreat/css/responsive.css
skin/frontend/default/simplegreat/css/menu2.css
app/code/local/ThemeAdminPanel/ExtraConfig/etc/config.xml app/design/frontend/default/simplegreat/template/catalog/product/view.phtml
app/design/frontend/default/simplegreat/template/page/html/head.phtml
app/code/local/ThemeAdminPanel/ExtraConfig/Model/Skins.php js/revolution/*.js
Added - Dark Theme (Predefined ready to set from admin panel color Skin)
Added -
Product box size change from admin panel (4 or 3 product per row)
Fixed - SimpleGreat Menu unaccessable Search field
Fixed - Google Chrome checkboxes problem
Fixed - Special/New homepage product grids behaviour for more than 4 products
Fixed - New/Sale badges z-index
Fixed - Colors changes
Fixed - "$mainclass in header.php not defined" frontend error
skin/frontend/default/simplegreat/css/styles.css
app/design/frontend/default/simplegreat/template/page/html/head.phtml
app/design/frontend/default/simplegreat/template/page/html/header.phtml app/code/local/ThemeAdminPanel/ExtraConfig/Model/Skins.php app/code/local/ThemeAdminPanel/ExtraConfig/Model/Productboxsize.php app/code/local/ThemeAdminPanel/ExtraConfig/etc/system.xml app/code/local/ThemeAdminPanel/ExtraConfig/etc/config.xml
app/design/frontend/default/simplegreat/template/catalog/product/new.phtml
app/design/frontend/default/simplegreat/template/catalog/product/special.phtml
Initial release